Scarmiglione and Skullnant

Scarmiglione isn't too hard to beat here, nor are his four companions. To get rid of them completely (since you can't really attack the primary foe here until they are gone), have everyone defend until you get to Palom, and have him cast on the four of them collectively the Fira spell. With that casted, it should kill the foes leaving only Scarmiglione. He likes to cast Thunder a lot (in fact, he counters with it) but doesn't prove to be too much of a threat. Have the twins use Twin Magic or have Palom cast Fira and Porom heal the party. Tellah should heal, cast fire, and defend when necessary. Cecil should concentrate on his weak physical attacks, but that's all he can do for right now. After a little bit of this, this simplistic foe should be no more!

There's little time to celebrate, however. As soon as you go across the bridge, Scarmiglione will attack the party again, this time in his "true form." Because of this, you may want to go back over the bridge, use a tent, and save your game before you take him on. Otherwise, here he is!